dt-bindings: clock: qcom,rpmcc: Add MSM8940 compatible

Document the qcom,rpmcc-msm8940 compatible.

Signed-off-by: Daniil Titov <daniilt971@gmail.com>
Signed-off-by: Barnabás Czémán <barnabas.czeman@mainlining.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20241231-rpmcc-v1-3-1212df9b2042@mainlining.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>